NumberField - groupSeparator converted into a comma

NumberField - groupSeparator converted into a comma

There is a strange NumberField behavior in 3.0.1.

1. Set decimal number format (1.234.567,123 - german/non-U.K. notation with a group separator and a comma).
2. Enter a number which requires ONE group separator, e.g. 1000
3. Leave the NumberField -> the number is formatted correctly (1.000)
4. Enter the NumberField again and add a digit (e.g. 11.000 or 1.1000)
5. Leave the NumberField -> The group separator now is interpreted as a comma -> 11 or 1
6. This does NOT happen, if you choose a number which has more than one group separator (e.g. 123.456.789)

I couldn't find the reason for that bug, but it makes the field unusable with a group separator formatting.

I've also tried using custom formats as a workaround:
- NumberFormat.getFormat("0,000.##") - this is even worse: 1.000 -> 11.000 = 0.011
- NumberFormat.getFormat("#,##0.00") - this works fine, but enforces 2 decimal places, which is not our desired behavior